1 IPC::Locker
*************
This is the IPC::Locker Perl Package.
1.1 Copyright
=============
This package is Copyright 1999-2017 by Wilson Snyder
.
This program is free software; you can redistribute it and/or modify
it under the terms of either the GNU Lesser General Public License
Version 3 or the Perl Artistic License Version 2.0.
This code is provided with no warranty of any kind, and is used
entirely at your own risk.
1.2 Description
===============
This package provides a server for locks and a package for clients to
access that server. The result is that clients can access named locks
on a Internet wide bases, solving critical section problems without the
mess of NFS or other file locking techniques.
1.2.1 IPC::Locker
-----------------
IPC::Locker is a Perl package which allows cross cluster locking. For
example:
my $lock = IPC::Locker->lock(host=>'example.std.com');
... Critical section ...
$lock->unlock();
See `man IPC::Locker' after installation.
1.2.2 lockerd
-------------
lockerd is the daemon that supports IPC::Locker. See `man lockerd'
after installation.
1.2.3 IPC::PidStat
------------------
IPC::PidStat is a Perl package which answers the question, "is pid X
running on host Y?". See `man IPC::PidStat' after installation.
1.2.4 pidstat
-------------
pidstat is a program which answers the question, "is pid X running on
host Y?". See `man pidstat' after installation.
1.2.5 pidstatd
--------------
pidstat is the daemon that supports IPC::PidStat and pidstat. See `man
pidstatd' after installation.
1.2.6 pidwatch
--------------
pidwatch is a program which starts other programs, and kill that program
when another job exists. See `man pidwatch' after installation.
1.2.7 uriexec
-------------
uriexec is a simple wrapper which allows executing a command which is
quoted using URI escapes. This prevents layered shells from
interpreting special characters. See `man uriexec' after installation.
1.2.8 check_lockerd and check_pidstatd
--------------------------------------
check_lockerd and check_pidstatd are Nagios plugins to check lockerd
and pidstatd. See the Nagios documentation `http://www.nagios.org' for
information on installing plugins.
1.3 Obtaining Distribution
==========================
The latest version is available at `http://www.perl.org/CPAN/'
Download the latest package from that site, and decompress. `gunzip
IPC::Locker_version.tar.gz ; tar xvf IPC::Locker_version.tar'
1.4 Supported Systems
=====================
This version of IPC::Locker has been built and tested on:
* i386-linux
* sparc-sun-solaris2.7
It should run on any system with perl and TCP/IP socketing.
1.5 Installation
================
1. `cd' to the directory containing this README notice.
2. Type `perl Makefile.PL' to configure IPC::Locker for your system.
3. Type `make' to compile IPC::Locker.
4. Type `make test' to check the compilation.
5. Type `make install' to install the programs and any data files and
documentation.
6. You may wish to install `lockerd' and `pidstatd' in a init.rc file
so that it is run at system startup. Depending on your
distribution, you may be able to just:
`cp init.d/lockerd /etc/init.d/lockerd' (On one server only)
`cp init.d/pidstatd /etc/init.d/pidstatd' (On all machines)
Edit paths in above to point to /usr/bin instead of
/usr/local/bin, if needed.
`/etc/init.d/lockerd start' (On one server only)
`/etc/init.d/pidstatd start' (On all machines)
`chkconfig lockerd on' (On one server only)
`chkconfig pidstatd on' (On all machines)
If you get "This account is currently not available." you need to
change the daemon account from a shell of /sbin/nologin to
/sbin/bash.
7. If you are using Nagios (`http://www.nagios.org'), sample scripts
to check the daemons are included in the nagios subdirectory.